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Process method for preparing magnesium hydroxide from magnesium sulfate

A technology of magnesium hydroxide and a process method, which is applied in the field of inorganic salts, can solve the problems of low efficiency and increased conversion process, and achieves the effects of simple operation, easy matching and strong practicability

Inactive Publication Date: 2014-07-30
彭振超 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is an ideal method for generating magnesium hydroxide, but the conversion efficiency of milk of lime and magnesium chloride to magnesium hydroxide is relatively low, and the conversion amount needs to be improved by new processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Firstly carry out the first step gypsum precipitation reaction step of the present invention: in terms of mass percentage (the same below), 20% magnesium sulfate solution is placed in the reaction vessel, 20% calcium chloride solution is added, and react under stirring to form calcium sulfate A mixture of precipitate and magnesium chloride solution, separated by filtration to obtain CaSO 4 2H 2 O dihydrate gypsum filter cake and MgCl 2 Magnesium chloride solution. The filter cake dihydrate gypsum is directly pelletized and air-dried to obtain gypsum for cement production; the intermediate product magnesium chloride solution is sent to the second step to prepare magnesium hydroxide.

[0032] Carry out the calcium and magnesium separation step of the second step dolomitic lime milk: the magnesium chloride solution obtained in the first step is added in the reaction vessel to react with the dolomitic lime milk, and the Ca(OH) in the dolomitic lime milk is stirred under t...

Embodiment 2

[0034] First, carry out the first step of gypsum precipitation reaction step of the present invention: 30% magnesium sulfate solution is placed in reaction container, add 30% calcium chloride solution, react under agitation, form the mixture of calcium sulfate precipitation and magnesium chloride solution, through Separated by filtration to obtain CaSO 4 2H 2 O dihydrate gypsum filter cake and MgCl 2 Magnesium chloride solution. Wash the filter cake dihydrate gypsum twice with water, send the washing water to dolomite lime for digestion and prepare refined dolomite lime milk; put the filter cake in a dryer to dry and decompose at 300°C to obtain hemihydrate gypsum, and then crush it to obtain CaSO 4 1 / 2H 2 O construction gypsum; the intermediate product magnesium chloride solution is sent to the second step to prepare magnesium hydroxide.

[0035] Carry out the calcium and magnesium separation step of the second step dolomitic lime milk: the magnesium chloride solution obt...

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Abstract

The invention relates to a method for preparing magnesium hydroxide from magnesium sulfate. The method comprises the steps of separating out gypsum by precipitation reaction of a magnesium sulfate solution and a calcium chloride solution to obtain a magnesium chloride solution; further performing calcium-magnesium separation reaction on the magnesium chloride solution and dolomite milk to enable calcium hydroxide in dolomite milk to form the calcium chloride solution with high solubility to enter a liquid phase and enable magnesium hydroxide in dolomite milk to enter a solid phase, washing and drying a solid-phase matter, namely magnesium hydroxide after solid-liquid separation to obtain magnesium hydroxide or calcining to obtain magnesium oxide; returning a liquid-phase matter, namely calcium chloride liquid to perform circulating reaction process with the magnesium sulfate solution. The method is particularly suitable for treatment of a flue gas desulfurization product, namely magnesium sulfate to realize resource utilization and reutilization and realize high-added value economic benefits.

Description

technical field [0001] The invention belongs to the technical field of inorganic salts, in particular to a magnesium salt production process for preparing magnesium hydroxide from magnesium sulfate. Background technique [0002] Magnesium hydroxide is an excellent flame retardant for plastic and rubber products. In terms of environmental protection, as a flue gas desulfurizer, it can replace caustic soda and lime as a neutralizer for acid-containing wastewater. It is also used as an oil additive for anti-corrosion and desulfurization. In addition, it can also be used in the electronics industry, medicine, sugar refining, as insulation materials and in the manufacture of other magnesium salt products. [0003] Traditional magnesium hydroxide production methods mainly include [0004] 1. Brine-lime method: The milk of lime made from brine and digested and deslagging lime is subjected to precipitation reaction in a sedimentation tank. After solid-liquid separation, the solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22C01F5/14C01F5/08
Inventor 彭振超韩默先
Owner 彭振超
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